. Catalogue of the Birds in the British Museum. 162 Nostril of T. albicaudatus, with no tubercular process. Key to the Species. a. Underneath white; throat Hack; tail white, with black band albicaudatus, p. 102. h. Underneath entirely black; tail black, banded with grey abbreviatns, p. 163. 1. TachjrtriorcMs albicaudatus. Aquila coliblanca, Azara, Apiod. i. p. GO (1802). Buteo albicaudatus, Vieill. N. Diet. iv. p. 477 (1816) ; Pucker. Ren. ct Mag. 1850, p. 87 ; StricU. Orn. Syn. p. 35 (1855). Spizaetus leucurus, Vieill. N. Diet, xxxii. p. 59 (1819). Falco pterocles, remm. PI. Col.
. Catalogue of the Birds in the British Museum. 162 Nostril of T. albicaudatus, with no tubercular process. Key to the Species. a. Underneath white; throat Hack; tail white, with black band albicaudatus, p. 102. h. Underneath entirely black; tail black, banded with grey abbreviatns, p. 163. 1. TachjrtriorcMs albicaudatus. Aquila coliblanca, Azara, Apiod. i. p. GO (1802). Buteo albicaudatus, Vieill. N. Diet. iv. p. 477 (1816) ; Pucker. Ren. ct Mag. 1850, p. 87 ; StricU. Orn. Syn. p. 35 (1855). Spizaetus leucurus, Vieill. N. Diet, xxxii. p. 59 (1819). Falco pterocles, remm. PI. Col. i. pis. 56, 139 (1823). Buteo pterocles, Less. Man. d'Orn. i. p. 103 (1828) ; Gray, Gen. B. i. p. 12 (1849); Cah. in Schumb. Reis. Giiian. iii. p. 739 (1848); Burm. Th. Bras. ii. p. 49 (1855) ; Sc/d. Mas. Buteones, p. 13 (18G2) ; Grai/, Hancl-l. B. i. p. 8 (1809) ; Pels. Orn. Bras. pp. 3, 390 (1871); 'Sel. i^- Salv. Nomencl. Av. Neotr. p, 119 (1873); &cM. Mas. Revue, Accipitr. p. 110 (1873). Buteo albicauda. Less. Traite, p. 81, pi. 15. fig. 2 (1831); Pticher. Rev. et May. de Zool. 1850, p. 214. Tacbytriorchis pterocles, Kaup, Classif. Sauq. n. Voq. p. 123 (1844); ul.'Confr. Orn. 1850, p. 75; Bp. Consp. ; p. 17 (1850). Buteo tricolor, Lid. Azara, p. 1 (1847, nee D'Orb,). Buteo leucurus, Lafr. Rev. Zool. 1849, p. 100. Youncf. General plumage black, the bases to the feathers white, the small wing-coverts margined, and the scapulars with concealed rufous spots, indicative of the approaching rufous of the adult; greater wing-coverts indistinctly margined with paler brown ; quills blackish brown, shaded externally with ashy grey, and barred with blackish, the secondaries browner, barred with blackish, all the bars showing more plainly below on the inner web, which is more or less Avhite from the base upwards; upper tail-coverts brown, white at base, the outer ones white, tipped with brown; tail bluish grey, crossed with 16 or 17 blackish bands, somew
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